pfSense is a free open source firewall and router. It is feature rich, but yet is secure and useful in its default configuration. You can install it on just about any PC, as long as it has two Ethernet ports. Here is my tutorial on how to install pfSense, using the Seeed Studio Odyssey Blue mini PC.
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Odyssey Blue J4125 - https://www.seeedstudio.com/Odyssey-B...
pfSense - https://pfsense.org/download
Etcher - https://www.balena.io/etcher/
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